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Finding the Fourth Proportional to 128,953.94, 177,969.22 and 72,365.54

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Solution

The fourth proportional to 128,953.94, 177,969.22 and 72,365.54 is: 99,871.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,953.94 : 177,969.22 = 72,365.54 : x
  2. Step 2: Convert to fraction form
    128,953.94/177,969.22 = 72,365.54/x
  3. Step 3: Cross multiply
    128,953.94x = 177,969.22 × 72,365.54
  4. Step 4: Simplify right side
    128,953.94x = 12,878,837,818.83
  5. Step 5: Solve for x
    x = 12,878,837,818.83/128,953.94
  6. Step 6: Final answer
    x = 99,871.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.